. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Plastic Specimens. The 3-foot-long solid plastic rods and vinyl tubes recovered after 24 months on the sea floor in 5,640 feet of water are shown in Figure 26. There were numerous borer holes present underneath the area where large wood bait pieces were fitted over the plastic specimens (Figure 27). The holes ranged from shallow to deep. The lower section, exposed about foot above the sediment layer, had more numerous borer holes than on the upper sections, which were exposed about 3 feet above the sediment. In other
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Plastic Specimens. The 3-foot-long solid plastic rods and vinyl tubes recovered after 24 months on the sea floor in 5,640 feet of water are shown in Figure 26. There were numerous borer holes present underneath the area where large wood bait pieces were fitted over the plastic specimens (Figure 27). The holes ranged from shallow to deep. The lower section, exposed about foot above the sediment layer, had more numerous borer holes than on the upper sections, which were exposed about 3 feet above the sediment. In other words, the borers were more active and more numerous near the sediment than 3 feet above the sediment layer. The borers did not penetrate directly into those areas of the plastic not in direct contact with the wood. The borers were unable to do so, probably because the plastics were either too hard or too smooth for the borers to obtain a firm foothold on the surface. The number and size of the borer holes found on the surface of the plastic specimens are presented in Table Figure 27. Plastic materials damaged by borers. 34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Muraoka, James S; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Engineering Laboratory
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